Some people would say slave, but that is not really correct because a slave could be sold, and a serf could not. Also, a slave had to do whatever told, but a serf simply had to fulfill obligatory duties.
A villein was very like a serf, except that a villein lived in town, but a serf was agricultural.
A cotter was very like a serf, but we really do not have other information on what a cotter was. It is thought that the cotter was technically free to leave the land, but this is speculation.
Yes, the noun astonishment is an abstract noun, a word for an emotional reaction.
Is undergone an abstract noun
The abstract noun is criticism.
The abstract noun is obligation.
Abstract noun of hopeless
Yes, the noun 'bondage' is an abstract noun, a word for the state of one who is bound as a slave or serf; a state of subjection to a force, power, or influence; a word for a concept.
Yes, the noun astonishment is an abstract noun, a word for an emotional reaction.
Is undergone an abstract noun
Concrete noun
The abstract noun is criticism.
The noun 'hopefulness' is an abstract noun, a word for an emotion.
The abstract noun is obligation.
Friendship has not abstract noun because It is a abstract noun
Abstract noun of hopeless
The abstract noun form is tourism.
The abstract noun for the adjective quick is quickness.
The abstract noun for the adjective vacant is vacantness. Another abstract noun form is vacancy.